Big Aldo

Having a couple of problems--please help--When I start out cold the ac blows nice and cold. After I stop and come back and restart the car, it never seems to blow cold again. Everything seems to be working correctly-except for the blower/fan switch has no effect--immediately goes to fastest speed when you turn on ac, and won' adjust down to a slower speed. Thanks in advance, Al

lyonsh

Starting cold then not: How long is it before you come back? It could be that your evaporator is freezing up, which could be caused by moisture in the system, or just be that you need a recharge.

Fan switch: Your variable switch's resistors are probably fried, so the system is defaulting to the high speed position.

greg454

It could be that your heater core shut off valve is not completely keeping the hot coolant from entering the heater core. If after driving the car and warming up the engine and then shutting it off the coolant will eventually heat sink the heater core. I would put manual shut off valves on the heater lines.

JB

A few questions, guys. Do you have to put cut off valves on both hoses? If not, which one then? And also, does anyone know which fitting is the low pressure side fitting on a '78? I want to add some of that leak sealant stuff, but I sure don't want to accidentally hook the thing up to the high pressure side.

JB

'78SA